Strap retainer



FIG. 1 is a perspective view of a strap retainer showing my new design,as seen from the top thereof;

FIG. 2 is a perspective view of the strap retainer as seen from thebottom thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is an end elevational view thereof; and

FIG. 6 is a bottom plan view thereof.

The ornamental design for a strap retainer, as shown.